#include <iostream>
#include <algorithm>
using namespace std;
typedef long long ll;
#define INF (ll)1e9

ll gcd(ll a,ll b) {
	while (a) {
		b %= a;
		swap(a, b);
	}
	return b;
}

int main()
{
	ll A, B, T; cin >> A >> B >> T;

	ll lcm = A*B / gcd(A,B);

	ll tmpT = T;
	tmpT %= lcm;
	if (tmpT + lcm <= T)tmpT += lcm;
	ll over_T = INF;

	for (int i = 0; i*B <= tmpT; i++) {
		over_T = min(over_T, (A - (tmpT - i*B) % A) % A);
	}
	int j = (tmpT / B) + 1;
	over_T = min(over_T, j*B - tmpT);

	cout << T + over_T << endl;

	return 0;
}